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Malaysia Airlines Flight 370 ___________ course and turned back toward Kuala Lumpur -- but there were no indications from the pilot that he was doing so.

A．must have changedB．could have changed
C．might have changedD．should have changed.

C

解析試題分析：考查情態(tài)動(dòng)詞。根據(jù)句意：馬來(lái)西亞的370航班可能改變了航道回到吉隆坡——但是并沒(méi)有什么跡象表明飛行員要這樣做。A肯定干了某事；B本可以干某事；C可能干了某事；D本應(yīng)該干某事。所以答案選C。
考點(diǎn)：考查情態(tài)動(dòng)詞

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